Electrocatalysis current distribution

Again a primary current distribution can be obtained for small values of electrolyte conductivities, x- or better with large values of exchange current densities, j0. The latter is of interest in electrocatalysis, because by simply changing the nature or the composition of the electrocatalyst we can achieve small values of Wa, and then a uniform primary current distribution. For the case of the electrocatalytic agents used in the industry, the expression of the Equation 13.33 is not useful at all. By introducing large polarizations, we have... 

A. A. Kulikovsky and K. Wippermann. Local current distribution in direct methanol fuel cells. In H. Liu and J. Zhang, editors, Electrocatalysis of Direct Methanol Fuel Cells, pages 449-486, Wiley, Weinheim, 2009. 

In electrocatalysis, the structure sensitivity of an adsorption process at the platinum-electrolyte interface is evidenced by the effect of surface orientation on the distribution of the configuration states in current vs. potential profiles [1-4]. The electrolyte composition at constant pH affects these adsorption states because of the anion-specific adsorption [2],... 

The intrinsic exchange current density,/ , is not a mere materials constant, but it depends on size distributions of catalyst nanoparticles, their surface structure, as well as surface composition in the case of alloy catalysts like PtRu. In this section, we discuss modeling approaches that highlight particle size effects and the role of surface heterogeneity in fuel cell electrocatalysis. 

Mediated enzyme electrodes are currently found in commercially successful consumer products, and continue to be the subject of intense research. In the coming years, as humankind searches for solutions to important problems such as the efficient, inexpensive, and distributed production of energy, the high catalytic rates made possible by enzyme mediation hold much promise. The combination of enzyme cascades with mediation could make complex, targeted electrocatalysis economically useful. 

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